Which of the following causes DNA to wrap
tightly around histones essentially preventing
transcription?
a. methylation
b. acetyl CoA
c. nitrogenation
d. dehydration
e. carbonation
A
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Fossils indicate that the first cells were similar
to existing a. viruses. b. fungi. c. prokaryotes. d. eukaryotes. e. algae.
Which of the following is generally accepted as the origin of living organisms?
a. Life was seeded on Earth from some distant place by meteorites and comets crashing into Earth. b. Spontaneous generation c. Life originated from an oxygen-rich atmosphere on Earth. d. Life can originate from nonliving matter. e. Prebiotic chemical evolution gave rise to progressively more complex molecules and eventually to living organisms
Imagine that a mutant mouse has a defect in the distribution of norepinephrine receptors, so that all the arteries and arterioles carry the type of norepinephrine receptor normally found around the brain and heart. What would you predict for this mouse in response to hemorrhage?
A. Blood vessels near the brain and heart will constrict, while blood vessels elsewhere will be dilated. B. Vasoconstriction near the brain and heart will prevent enough blood from reaching those organs. C. Blood vessels near the brain and heart will be dilated, while blood vessels elsewhere will constrict. D. Vessels throughout the body will stay dilated, resulting in inadequate blood flow to the brain and heart.
The degree of turbidity in a broth culture correlates to the amount of cell growth.
Answer the following statement true (T) or false (F)